January weather forecast in Portsmouth

January in Portsmouth is the snowiest and the coldest month of the year. In January, the weather in Portsmouth is typically cold. Average daily high temperature in January is about 2 degrees above zero. On average, Portsmouth has 12 cloudy, 6 sunny, 6 partly cloudy, 5 rainy, and 2 snowy days in January. The rains are usually heavy. January as well as February, March, and December is considered the most uncomfortable time to visit Portsmouth.